I am having difficulty with this maybe I can discuss this problem with someone | Together C & C++ | Page 1

somber shuttleBOT Oct 30, 2022, 11:20 PM

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keen dove Oct 30, 2022, 11:55 PM

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rip

keen dove Oct 31, 2022, 3:48 AM

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welp

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It appears no-one wants to help :(

dense anvil Oct 31, 2022, 4:42 AM

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!homework

mighty elkBOT Oct 31, 2022, 4:42 AM

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Not_Somebody

We Don't Do Your Homework

Welcome to Together C&C++! We won't do your homework for you, but we are happy to help you learn and point you in the right direction. We can help most if you have a specific question / have started writing the code.

(Please refer to our #rules, 5.)

keen dove Oct 31, 2022, 4:56 AM

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@dense anvil Im not asking for someone to do my homework lol

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litterally read the title

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maybe I can discuss this problem with someone

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aka where do i start

dusky walrus Oct 31, 2022, 5:08 AM

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try breaking the problem into a smaller piece? Could you do it in just one dimension if it was an array instead of a matrix?

keen dove Oct 31, 2022, 5:14 AM

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chetco!!!!!!!!!!

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my 2x hero

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hi again

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uhhh yes I think so

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thats a good idea maybe I can do it in peices

dusky walrus Oct 31, 2022, 5:17 AM

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i just did the assignment so its really not that hard

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i promise, it just looks like a lot

keen dove Oct 31, 2022, 5:17 AM

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wait it took u 9 minutes?

dusky walrus Oct 31, 2022, 5:17 AM

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its only about 30 lines of code including printing the result so trust me you got this

keen dove Oct 31, 2022, 5:18 AM

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ok lemme

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try and work through it here

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I gotta speed run this

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like fr fr

dusky walrus Oct 31, 2022, 5:18 AM

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haha no take your time, just because I have dozen years experience in C

keen dove Oct 31, 2022, 5:19 AM

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... mostly because its the night before halloween and I am alone with no-one doing CSC and math

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...troll despair

dusky walrus Oct 31, 2022, 5:20 AM

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try one dimension. I wil lgive you a hint if you like (use modulus operator)

keen dove Oct 31, 2022, 5:20 AM

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ohhh

dusky walrus Oct 31, 2022, 5:20 AM

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L = [6, 10, 17]
s = ""
for i in range(2):
    s += str(L["""??? what goes here???"""]) + " "
print(s[:-1])

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one dimension example

keen dove Oct 31, 2022, 5:20 AM

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what on earth is that

dusky walrus Oct 31, 2022, 5:20 AM

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in python

keen dove Oct 31, 2022, 5:20 AM

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oh

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ok

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ima work in the middle now

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wait

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what

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no what I did made no sense

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deleted it all

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Actually maybe I don't know how to do it in one dimention

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the hardest thing im having

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is have the same row repeat multiple times

dusky walrus Oct 31, 2022, 5:25 AM

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its similar to repeating the same elements multiple times in 1 dimension

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its all about how you index the 2d array

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imagine you have array like
double A[5] = {-4, 5, 3, 9, -2};

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A[2] would give you 3

keen dove Oct 31, 2022, 5:26 AM

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right

dusky walrus Oct 31, 2022, 5:27 AM

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A[6] is out of bounds

keen dove Oct 31, 2022, 5:27 AM

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true

dusky walrus Oct 31, 2022, 5:27 AM

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in comes modulus operator

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the expression x % 5 will always give you a result less than 5

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so you are never out of bounds

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and A[6 % 5] simplifies to A[1]

keen dove Oct 31, 2022, 5:27 AM

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coudlent u just loop through

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each element of the array

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and be like while its less than 5

dusky walrus Oct 31, 2022, 5:28 AM

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you could

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but array B may be larger than A

keen dove Oct 31, 2022, 5:28 AM

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i think thats how im supposed to do it

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oh

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I see

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sorta

dusky walrus Oct 31, 2022, 5:29 AM

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evaluate expression A[x % 5] for x between 0 to 10

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and you wil see a repetition

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it gives all elements of A then starts back at the beginning when x is out of bounds of A

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and you could keep looping x as long as you want really

keen dove Oct 31, 2022, 5:31 AM

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ohhh thats cheeky

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oh my goodness you big brain god

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does this seem right

dusky walrus Oct 31, 2022, 5:34 AM

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i assumed first dimension is 'rows' of the matrix

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you have n rows I believe, so you are on the right track but you did not use A yet

keen dove Oct 31, 2022, 5:35 AM

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oops hahaha

dusky walrus Oct 31, 2022, 5:35 AM

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you probably want i < somethingelse ?

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because for me k is columns

keen dove Oct 31, 2022, 5:35 AM

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s!

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oops

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good catch

dusky walrus Oct 31, 2022, 5:35 AM

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but your online submission thing might prefer a different thing idk

keen dove Oct 31, 2022, 5:36 AM

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eh does not matter

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prof does not look at the code i could use litterally anything

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a computer checks it

dusky walrus Oct 31, 2022, 5:36 AM

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if you use wrong index your matrix will be transposed in memory

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and computer will say wrong answer

keen dove Oct 31, 2022, 5:37 AM

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oh

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holy crap

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we are cooking now!!

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one dimension is complete

dusky walrus Oct 31, 2022, 5:39 AM

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looking better but might be wrong still idk. if s is rows of B then what is correct between these two options:
B[row][column]
B[column][row]

keen dove Oct 31, 2022, 5:39 AM

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lemme pull up expected output

keen dove Oct 31, 2022, 5:40 AM

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dusky walrus looking better but might be wrong still idk. if `s` is rows of `B` then what is ...

n and s are rows,
k and t are columns

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and

dusky walrus Oct 31, 2022, 5:40 AM

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but if i write B[x] what did I index into, the row or column?

keen dove Oct 31, 2022, 5:41 AM

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row

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i think

dusky walrus Oct 31, 2022, 5:41 AM

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then your code B[0][i] = A[0][i%n]; is using i to index the column?

keen dove Oct 31, 2022, 5:42 AM

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dusky walrus then your code `B[0][i] = A[0][i%n];` is using `i` to index the column?

wait a second

dusky walrus Oct 31, 2022, 5:42 AM

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I think we can assume its B[row][col]

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but its still ambiguous

keen dove Oct 31, 2022, 5:42 AM

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gotcha

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i swapped it

dusky walrus Oct 31, 2022, 5:43 AM

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actually reading your assignment comments they say "if A is a 2 x 3 matrix" and then it shows 2 rows 3 columns

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so yeah now it looks correct your last change

keen dove Oct 31, 2022, 5:43 AM

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alrighty

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now for 2d

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how would I approach this

dusky walrus Oct 31, 2022, 5:44 AM

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when I am stuck I like to take a guess

keen dove Oct 31, 2022, 5:45 AM

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Ima guess

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that

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I make another loop

dusky walrus Oct 31, 2022, 5:45 AM

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good guess

keen dove Oct 31, 2022, 5:45 AM

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ok

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so since its rows

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by collomns

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my nested loop will be looping le columns

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so then I do the same trick

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that you did

dusky walrus Oct 31, 2022, 5:46 AM

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sounds good

keen dove Oct 31, 2022, 5:46 AM

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modulo hack

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but colomns

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wait a second

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hmmm

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wait a secondo

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i dont know if this will work

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cus im just

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indexing [0] of the row and columns

dusky walrus Oct 31, 2022, 5:48 AM

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ok but you are close except

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B[i][0] = A[i%n][0]; should be a red flag because we don't assign arrays to other arrays

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which feels like what u intended?

keen dove Oct 31, 2022, 5:50 AM

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I have to assign B

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to A

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and then it prints out B

dusky walrus Oct 31, 2022, 5:50 AM

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you can do the whole function in like 3 lines of code not counting declarations and braces

keen dove Oct 31, 2022, 5:51 AM

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hmm

dusky walrus Oct 31, 2022, 5:52 AM

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sneaky delete for u just a hint

keen dove Oct 31, 2022, 5:52 AM

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I don't know whats wrong with mine tho

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I know its wrong

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I think I have to assign B to A there

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in order to update the columns

dusky walrus Oct 31, 2022, 5:52 AM

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idk is it wrong? I feel like it is but I don't actually know lol

keen dove Oct 31, 2022, 5:53 AM

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it is wrong

dusky walrus Oct 31, 2022, 5:53 AM

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you are assigning only one element in that line of code each time you loop through i

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so you should expect it to be wrong because you make a total of i + j assignments for a s x t matrix

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or s + t assignments i think?

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also you overwrite your assignments i believe

keen dove Oct 31, 2022, 5:54 AM

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how would I change it without overwring it

dusky walrus Oct 31, 2022, 5:55 AM

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if i = 0 you overwrite B[0][0] and then move into the loop and with j = 0 you instantly overwrite B[0][0] yet again

keen dove Oct 31, 2022, 5:55 AM

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ah right

dusky walrus Oct 31, 2022, 5:55 AM

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at no point are you indexing the columns, only the rows, you are still in one dimension

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only ever indexing column 0

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now whenever you index the columns you only do so on row zero

keen dove Oct 31, 2022, 5:58 AM

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maybe that should be

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j

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nvm it should not be j

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*i was referencing B[j][j] = A[j][j%k] but that did not work

dusky walrus Oct 31, 2022, 5:59 AM

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I really want to give you another hint but I am shoehorning you into the 'correct' answer only because its very simple solution and the one they probably want you to find

keen dove Oct 31, 2022, 6:00 AM

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wait

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maybe it should be i

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I GOT IT

dusky walrus Oct 31, 2022, 6:01 AM

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funny thing I believe last time I helped you that you found the solution before me, I think you will find this

keen dove Oct 31, 2022, 6:01 AM

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i think

dusky walrus Oct 31, 2022, 6:01 AM

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correct but you did not need the outer loop assignment only the inner part

keen dove Oct 31, 2022, 6:01 AM

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oh

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well

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its there for good keeping if it works

dusky walrus Oct 31, 2022, 6:02 AM

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lol

keen dove Oct 31, 2022, 6:02 AM

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hoooooly

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chetco

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man

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thank you

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i might have time to take a shower and go outside tonight

dusky walrus Oct 31, 2022, 6:02 AM

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no problem easy homework is easy

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alright have a good one

keen dove Oct 31, 2022, 6:03 AM

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!solved

#I am having difficulty with this maybe I can discuss this problem with someone